Eurocopter

Eurocopter France

Sylvie Jacqueline Garcin

Etienne Jean Rampal

Jean Joseph Mondet

The rotating plate of the system is fixed in rotation with the rotor by a driver with two rigid driving tracks extending axially and diametrically opposite in being fixed in rotation with the rotor. Each track engages with one of two driving fingers fixed in rotation with the rotating plate and diametrically opposite on this latter. Each track has two webs between which one finger is engaged with the result of following on this track a rectilinear trajectory, parallel to the rotor axis and a circular arc trajectory centerd on this axis, respectively in the case of change of collective and cyclic pitch.

Swash-plates system for control of the pitch of rotor blades with rotating plate driver

The rotor comprises, for each blade, an inner and an outer flap stop which are fixed to the blade and have a bearing surface which is planar with a cylindrical portion, facing an inner and an outer flap stop fixed to the hub and with torus-shaped bearing surfaces with their convexness facing towards the flap stops of the blade and in the shape of an arc of a circle centered on the axis of drag of the blade.

Rotorcraft rotor with fixed flap stops on blades and hub, and with

The rotating and non-rotating swash-plates are guided in axial translation and in tilting on the rotor axis by a non-rotating axial guide arrangement, such as two pillars, and slides on each of which slides one of two pads carrying diametrically opposite trunnions, enabling the pivoting of the non-rotating plate around a first diametrical axis, whereas the sliding movements of the pads on the slides guide the pivoting movements of the non-rotating plate around a second diametrical axis perpendicular to the rotor axis and first diametrical axis, and which is the axis of the cylindrical face of the slides.

Swash-plate device for controlling the pitch of the blades of a rotor

The device includes anti-cone stops projecting outward from at least two coaxial rings that can rotate about the rotor axis on the top face of the hub. Flyweights are each mechanically joined to one of the rings by a mechanism for driving the latter in rotation from the 'ground' position, in which each anti-cone stop is facing an upper bearing shoe of the corresponding blade, to the 'flight' position, in which the anti-cone stops are retracted against elastic mechanisms returning them to the 'ground' position.

Growing community of inventors

Carry-Le-Rouet, France

Sylvie Jacqueline Garcin